EP 0887944 A2 19981230 - Digital processing radio receiver
Title (en)
Digital processing radio receiver
Title (de)
Funkempfänger mit digitalen Signalverarbeitung
Title (fr)
Radiorécepteur avec traitement numérique de signaux
Publication
Application
Priority
US 88369297 A 19970627
Abstract (en)
An adaptive intermediate frequency bandwidth control system detects IF signal levels both before and after channel filtering. The two levels are compared to provide a measure of the presence of interfering adjacent channels. This measure is compared to a programmable threshold and the IF bandwidth is narrowed if any interferers are detected. Digital FIR or IIR filtering is used. The invention allows bandwidth switching to be done very quickly with minimal transient effects. A difference threshold is selected depending upon the IF channel bandwidth being used at any given time. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP US)
H03G 5/28 (2013.01 - EP US); H04B 1/1036 (2013.01 - EP US); H04B 2001/1054 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
US 6178211 B1 20010123; EP 0887944 A2 19981230; EP 0887944 A3 20020403; JP H1131981 A 19990202; US 6058148 A 20000502
DOCDB simple family (application)
US 42555099 A 19991022; EP 98304700 A 19980615; JP 16609298 A 19980529; US 88369297 A 19970627